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Property, plant and equipment -price assumptions used for impairment calculations (Details) $ in Billions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / bbl $ / MMBTU	Dec. 31, 2018 $ / bbl $ / MMBTU
Price Assumptions Used For Impairment Calculations [Line Items]
Description of changes in methods and assumptions used in preparing sensitivity analysis	This illustrative impairment sensitivity, based on a simplified method, assumes no changes to input factors other than prices; however, a price reduction of 30% is likely to result in changes in business plans as well as other factors used when estimating an asset’s recoverable amount.
Estimated impairment loss due to decline in commodity prices | $	$ 15
Percentage of estimated decline in commodity prices	30.00%
Brent Blend [Member] | 2020 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated crude oil or Gas price per unit | $ / bbl	59	68
Brent Blend [Member] | 2025-2029 [Member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated crude oil or Gas price per unit | $ / bbl	77	78
Brent Blend [Member] | 2030 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated crude oil or Gas price per unit | $ / bbl	80	82
NBP Natural Gas Price [Member] | 2020 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated crude oil or Gas price per unit	4.2	(7.7)
NBP Natural Gas Price [Member] | 2025-2029 [Member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated crude oil or Gas price per unit	7	(8.2)
NBP Natural Gas Price [Member] | 2030 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated crude oil or Gas price per unit	7.5	(8.2)
Henry Hub Natural Gas Price [Member] | 2020 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated crude oil or Gas price per unit	2.4	(3.2)
Henry Hub Natural Gas Price [Member] | 2025-2029 [Member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated crude oil or Gas price per unit	3.1	(4.1)
Henry Hub Natural Gas Price [Member] | 2030 [member]
Price Assumptions Used For Impairment Calculations [Line Items]
Estimated crude oil or Gas price per unit	3.6	(4.1)

X

- Definition

Crude oil or gas price assumption used for impairment calculations in each geographic area during the reporting period, presented in USD per unit, number of barrels of oil or mmbtu.

+ References

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- Definition

Potential impairment losses related to property plant and equipment due to decline in commodity prices.

+ References

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+ Details

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- Definition

Percentage of estimated decline in commodity price forecasts over the lifetime of the assets.

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- Definition

The description of changes in the methods and assumptions used in preparing a sensitivity analysis for the types of market risk to which the entity is exposed. [Refer: Market risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 40
-Subparagraph c
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-URIDate 2019-03-27

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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